CN102759464B - The method and apparatus of sulfur hexafluoride electrical equipment on-line monitoring gas circulation - Google Patents
The method and apparatus of sulfur hexafluoride electrical equipment on-line monitoring gas circulation Download PDFInfo
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- CN102759464B CN102759464B CN201110112398.4A CN201110112398A CN102759464B CN 102759464 B CN102759464 B CN 102759464B CN 201110112398 A CN201110112398 A CN 201110112398A CN 102759464 B CN102759464 B CN 102759464B
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Abstract
The invention discloses the method and apparatus of a kind of sulfur hexafluoride electrical equipment on-line monitoring gas circulation, belong to the method and apparatus of sulfur hexafluoride electrical equipment analyte monitoring。It is characterized in that: at SF6Arranging band heating module on electrical equipment lower gas fairlead, heat block is close to the outer wall of gas fairlead, adds connecting tube between the pipe on every phase equipment heating module top；This device has high-frequency induction heating block, thermometric control unit, overtemperature prote unit, power subsystem and alternate connecting line。Owing to the present invention is according to " expanding with heat and contract with cold " principle, utilize heat differential balancing technique, after monitored equipment three-phase gas fairlead alternately heats, just the microcirculation of tested device interior gas and detection indoor gas is defined, accelerating trouble location insulant catabolite and enter sensing chamber, make device interior Hidden fault detect as early as possible, the maintenance in time for equipment provides scientific basis, safety and economic operation for power generation is played a positive role, and has broad prospect of application。
Description
Technical field
Patent of the present invention relates to the method and apparatus of sulfur hexafluoride (hereinafter abbreviated as SF6) electrical equipment analyte monitoring, the method and apparatus of a kind of sulfur hexafluoride electrical equipment on-line monitoring gas circulation specifically。
Background technology
It is known that, SF6 gas has been not only good chemical stability, and there is excellent insulating properties and arc extinction performance, it is widely used in high voltage electric equipment after the eighties as insulation and arc-extinguishing medium from last century, effectively improves the safety and economic operation of production。But due to the design at equipment, material, there are some weak links in the aspect such as mounting process and operation maintenance, equipment is made to would be likely to occur some insulation hidden danger, and have the detection means of code to be difficult to be detected at present, though the SF6 electrical equipment analyte offline inspection succeeded in developing in recent years can detect insulation defect, but because the detection cycle is longer, the recall rate of minor insulation hidden danger is still not high, after having the putting equipment in service of hidden danger, under the effect of heat and electricity, insulation is gradually lowered, defect constantly expands, until having an accident, learn from SF6 electrical equipment accident statistics over the years, insulation fault accounts for 60%, seriously threaten the safety and economic operation of power generation, cause bad social influence。
Development along with State Maintenance and intelligent grid, analyte in SF6 electrical equipment gas is taked on-line monitoring by an urgent demand, the characteristic component of insulant cracking in monitoring SF6 gas in real time, detection built-in electrical insulation hidden danger in time, State Maintenance for equipment provides scientific basis, makes the safety and economic operation important means improving power generation。
Owing to the object of present invention monitoring is SF6 gas with pressure, its density is big, and internal without the obvious temperature difference, gas remains static, and the catabolite that trouble location produces hardly enters monitoring room。And currently used air pump performance cannot meet equipment requirements, it is impossible to realize the forced circulation of gas。Therefore, explore a kind of applicable technical scheme, it has also become when business urgently。
Summary of the invention
Present invention aim to address the gas of a SF6 electrical equipment catabolite on-line monitoring system circulation difficult problem, accelerate the diffusion of insulant catabolite so that it is the method and apparatus of a kind of sulfur hexafluoride electrical equipment on-line monitoring gas circulation that internal Hidden fault is detected in time。
The technical solution adopted for the present invention to solve the technical problems is: the method and apparatus of a kind of sulfur hexafluoride electrical equipment on-line monitoring gas circulation, it is characterized in that: on SF6 electrical equipment lower gas fairlead, band heating module is set, heat block is close to the outer wall of gas fairlead, adds connecting tube between the pipe on every phase equipment heating module top；This device has high-frequency induction heating block, thermometric control unit, overtemperature prote unit, power subsystem and alternate connecting line。
Described heating module is in succession to heat gas in pipe to be higher than 50 DEG C to than ambient temperature, and in pipe, gas temperature rising expands, and moves up；Sensing chamber and other two-phase do not add the temperature ratio of gas in heat pipe to add gas in heat pipe low 50 DEG C, but density is big and move down, and gas so in the detection system produces microcirculation, is conducive to the catabolite flow detection room that apparatus body fault produces。
Effective heated length of described heating module wants more than 200mm, so just can ensure that the flowing of apparatus body and the gas in sensing chamber has enough trend motive forces when ambient temperature is within the scope of-30 DEG C to+40 DEG C, makes internal gas have bigger translational speed。
Described gas fairlead not only resistance is as far as possible little, and wants suitably equipped with connecting tube, the position of its connection and angle between the pipe on every phase equipment heating module top, in order to improving the gas in the heating mutually of tested equipment can with the translational speed of other two-phase gases。
Described heating module adopts high-frequency induction heating, and its efficiency of heating surface is high, speed is fast, homogeneous heating, safe and reliable。The heating-up temperature arranged is higher 50 DEG C than ambient temperature, makes the gas density adding the density ratio apparatus body of the SF6 gas in heat pipe little 1.21 to 1.16 times, is conducive to the early detection of internal fault。
Described heater includes: heating module, power module, temperature conditioning unit, program-controlled unit, temperature measurement unit and overtemperature prote unit。Wherein every heat phase module there are heating unit, temperature measuring unit, include power supply, program control temperature control and protected location in the controller。
Described device has high-frequency induction heating block, thermometric control unit, overtemperature prote unit, power subsystem and alternate connecting line etc. to be existing known technology。
The present invention is according to " expanding with heat and contract with cold " principle, utilize heat differential balancing technique, the gas fairlead of monitored equipment A, B, C three-phase arranges heating module, the communicating pipe of three-phase equipment it is mounted with again on the top of heating module, principle according to " expanding with heat and contract with cold ", adding density after the gas in heat pipe is heated little, move up, through top, connecting tube flow to apparatus body；The gas density of apparatus body and sensing chamber is bigger than the gas density added in heat pipe, and moves down, and flow to sensing chamber；Heating module on three-phase fairlead is heating alternately, just defines the microcirculation of tested device interior gas and detection indoor gas, accelerates trouble location insulant catabolite and enters sensing chamber, so that it is guaranteed that the early detection of Hidden fault。
The invention has the beneficial effects as follows: owing to the present invention is according to " expanding with heat and contract with cold " principle, utilize heat differential balancing technique, after monitored equipment three-phase gas fairlead alternately heats, just the microcirculation of tested device interior gas and detection indoor gas is defined, accelerate trouble location insulant catabolite and enter sensing chamber, device interior Hidden fault is made to detect as early as possible, maintenance in time for equipment provides scientific basis, safety and economic operation for power generation is played a positive role, and has broad prospect of application。
Accompanying drawing explanation
Below in conjunction with drawings and Examples, the present invention is conducted further description。
Fig. 1 is SF6 gas circulating technology of the present invention and apparatus structure block diagram。
1 controller in figure, 2 sensing chamber, 3 heating modules, there are 3A, 3B and 3C three pieces, 4 gas connection pipes, 5 gate valves, have 5A, 5B and 5C three, 6 equipment lower gas fairleads, 7 detected equipment, there is A, B, C three-phase。
Fig. 2 is heater functional-block diagram of the present invention:
In block diagram, heater specifically includes that heating module, power module, temperature conditioning unit, program-controlled unit, temperature measurement unit and overtemperature prote unit。Wherein every heat phase module includes heating, temperature measuring unit, include power supply, program control temperature control and protected location in the controller。
Detailed description of the invention
Embodiment 1: refer to view, tested device A, the gas fairlead (6) of B, C three-phase 7 communicating pipe 4 bottom pipeline on, the high-frequency induction heating module 3 in succession heated is set, as when A phase pipe heating module works, gas temperature in pipe rises, gas expansion, decrease in density, gas flows up；Bottom sensing chamber and B, C two-phase are not heated, and in pipe, gas temperature is low relative to A phase 50 DEG C, and in pipe, gas density is bigger than the density of A heat phase block, and gas will be moved downward to A and be added in heat pipe。When in like manner B, C two-phase being heated respectively, also result in gas in pipe and move up, so just cause internal gas microcirculation。When ambient air temperature is from-30 DEG C to+50C DEG C, big 1.215～1.155 times of density in density ratio A heat phase block in its pipe, such density contrast will promote the flowing of SF6 gas, accelerates the dissolving diffusion of catabolite, is conducive to the early detection of internal fault。
The present embodiment scheme is as follows: (have 7A respectively at tested equipment " 7 ", 7B and 7C three) the lower tube outer wall of communicating pipe " 4 " of gas fairlead " 6 ", high-frequency induction heating module " 3 " is close in setting (has 3A respectively, 3B and 3C three), by control unit " 1 " to when wherein a phase pipe is heated, pipe in gas temperature rise to higher than other two-phases do not heated to setting value time, by communicating pipe " 4 " and fairlead " 6 ", gas is made to form microcirculation between sensing chamber " 2 " and tested equipment " 7 ", thus accelerating the gas flowing of tested device interior, the analyte that insulant cracking produces is made to dissolve quickly, it is diffused in sensing chamber, be conducive to the early detection of Hidden fault。
When heat control unit sends the work of instruction 3A module, A phase pipe is heated, makes tube wall temperature rise to higher 50 ± 0.2 DEG C than ambient temperature, after one hour, stop heating 1 hour；Same when heat control unit sends the work of instruction 3B (or 3C) module, B phase (or C phase) pipe follow procedure is heated。There are 4 alternate cycles heating such every day, so just form the microcirculation of monitoring system gas。Power subsystem mainly provides control unit working power and high-frequency induction heating power。
This equipment safety is reliable, simple in construction, easy to use, it is achieved that SF6 inside electric appliance gas microcirculation, be applicable to various SF6 electrical equipment gas on-line monitoring, application prospect is extensive。
When SF6 electrical equipment analyte on-line monitoring system puts into operation, first power turn-on, after self-inspection is normal, each detection unit just enters normal detection after preheating 10 minutes。Heating module on detected equipment gas fairlead is by setup program respectively to A, B, C tri-heat phase 1 hour, it is higher 50 ± 1 DEG C than ambient temperature for controlling heating-up temperature, heating is stopped after 1 hour, after internal gas microcirculation 1 hour, controlling system start-up and another heat phase module is pressed said procedure work, one cycle of three-phase counts six hours, circulates four every day, so just the dissolving diffusion of fault zone catabolite is accelerated, it is achieved the early detection of latency。
In order to prevent heating module overtemperature, this device is provided with overtemperature alarm and defencive function, it is ensured that safe and reliable。
Embodiment 2:SF6 transformator analyte on-line monitoring gas-recycling plant is similar to embodiment 1, but normally only one, two, the SF6 transformator of Mei Zuo transformer station at present, if one, air vent then should be installed in the side of high and low pressure sleeve pipe respectively, by stainless steel tube, detected gas is caused sensing chamber, the correct position of stainless steel tube is installed heating module, control system sequentially activates heating module, thus forming the microcirculation of monitoring system gas, accelerate the dissolving diffusion of fault zone catabolite, it is achieved the early detection of latency。
Embodiment 3: if there being multiple stage transformator, or during multiple stage transformer, its analyte on-line monitoring gas-recycling plant also embodiment 1 is similar, general, as long as air vent is installed in the bottom of every equipment, by stainless steel tube, detected gas is caused sensing chamber, the correct position of stainless steel tube is installed heating module, control system sequentially activates heating module, thus forming the microcirculation of monitoring system gas, accelerate the dissolving diffusion of fault zone catabolite, it is achieved the early detection of latency。
Claims (4)
1. a device for sulfur hexafluoride electrical equipment on-line monitoring gas circulation, is characterized in that: at SF6Arranging, on electrical equipment lower gas fairlead, the heating module in succession heated, heat block is close to the outer wall of pipe, and adds connecting tube between the pipe on every phase equipment heating module top；A phase pipe is heated and stops heating one hour after one hour by heating module, then stops heating one hour after B phase pipe is heated one hour, then stops heating one hour after C phase pipe is heated one hour, and one cycle of three-phase counts six hours, and such circulation is heated in succession；This device is made up of high-frequency induction heating block, thermometric control unit, overtemperature prote unit, power subsystem and alternate connecting line；Described heating module adopts high-frequency induction heating block。
2. the device of a kind of sulfur hexafluoride electrical equipment on-line monitoring gas according to claim 1 circulation, it is characterized in that: described heating module be gas in pipe is heated in succession to than ambient temperature higher than about 50 DEG C, in the pipe that other two-phase is not heated, to add gas in heat pipe low about 50 DEG C for the temperature ratio of gas。
3. the device of a kind of sulfur hexafluoride electrical equipment on-line monitoring gas according to claim 1 circulation, is characterized in that: effective heated length of described heating module wants more than 200mm。
4. the device of a kind of sulfur hexafluoride electrical equipment on-line monitoring gas according to claim 1 circulation, is characterized in that: described heating module adopts high-frequency induction heating, and it adds the SF in heat pipe6The gas density of the density ratio apparatus body of gas is little 1.21 to 1.16 times, adds the SF in heat pipe6Gas flow apparatus body, and the gas of apparatus body flows into sensing chamber by the non-heating tube of other two-phases, according to certain procedures, A, B, C three-phase heating module is heated in succession, thus realizing the continuous circulation of SF6 gas, is conducive to the early detection of internal fault。
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| CN201110112398.4A CN102759464B (en) | 2011-04-29 | 2011-04-29 | The method and apparatus of sulfur hexafluoride electrical equipment on-line monitoring gas circulation |
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| CN102759464B true CN102759464B (en) | 2016-06-22 |
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| CN106644826A (en) * | 2016-12-13 | 2017-05-10 | 国网电力科学研究院武汉南瑞有限责任公司 | Device for monitoring micro-water density of SF6 on line |
| CN109884260A (en) * | 2019-04-12 | 2019-06-14 | 国网江苏省电力有限公司 | A kind of air-path control system, method and gas insulated combined electrical equipment GIS device |
| CN117030535B (en) * | 2023-09-28 | 2024-02-02 | 国网江苏省电力有限公司电力科学研究院 | Built-in gas-insulated equipment gas state multi-parameter sensor |
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| CN2515680Y (en) * | 2002-01-22 | 2002-10-09 | 常州市科能电器有限公司 | Real-time on line monitor for controlling SF6 gas |
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| CN101271084A (en) * | 2008-04-29 | 2008-09-24 | 河海大学常州校区 | Ultrasonic wave detecting system and method for centralized circulation type sulfur hexafluoride gas concentration |
| CN101285407A (en) * | 2008-06-02 | 2008-10-15 | 沈志强 | Power machine powered by thermal expansion |
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| DE10325702B3 (en) * | 2003-06-06 | 2004-09-16 | M & C Products Analysentechnik Gmbh | Exhaust gas measuring device, used in power stations and waste incineration plants, has heating device for heating gas supplied through aluminum oxide charge |
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| CN2515680Y (en) * | 2002-01-22 | 2002-10-09 | 常州市科能电器有限公司 | Real-time on line monitor for controlling SF6 gas |
| CN200979479Y (en) * | 2006-06-26 | 2007-11-21 | 山东中瑞电气有限公司 | A sulfur hexafluoride leakage monitor |
| CN101271084A (en) * | 2008-04-29 | 2008-09-24 | 河海大学常州校区 | Ultrasonic wave detecting system and method for centralized circulation type sulfur hexafluoride gas concentration |
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